lundell



A. E. LUNDELL.

TELEPHONE EXCHANGE SYSTEM. APPLICATION FILED AUG.I7. 191s. RENEWED JUNE 6. 1918.

1,330,200. Patented Feb.10,19 20.

6 SHEETS-SHEET I- wl i //7 yen/0r: A/ben 5 40/746.

A. E. LUNDELL.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED AUG.17. 191s. RENEWED JUNE 6.1918.

Patented Feb. 10, 1920.

6 SHEETS-SHEET 2.

was? mi e Erwin NNN A. E. LUNDELL.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED AUG.17. 191s. RENEWED JUNE 6.1918.

1,330,200. Patented Feb. 10,1920.

6 SHEETSSHEET 3.

A. E. LUNDELL.

TELEPHONE EXCHANGE SYSTEM. APPLICATION FILED AUGJI, 19 6. RENEWED JUNE 6.1918.

A. E. LUNDELL.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED AUG.I7. me. RENEWED JUNE 6.1918.

1 ,330,200, Patented Feb. 10, 1920.

6 SHEETS-SHEET //7l /7/0/'. A/ben 5 Lunde/Z A. E. LUNDELL.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED AUGJIY, I916. RENEWED JUNE 6.v 1918.

1,330,200. Patented Feb. 10,1920.

6 SHEETSSHEET 6- //7Ve/7 for. A/fien Zlanae/l nay UNITED STATES nrnnr OFFICE.

ALBEN E. LUNDELL, OF NEW YCRK, Y., ASSIGNQR 1'0 WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORFORATICN OF NEW YORK.

TELEPI-ZONE-EXCHANGE SYSTEM.

Specification of Letters Patent.

Patented Feb. 10, 1920.

Application filed August 17, 1918, Serial No. 115,523. Renewed June 6, 1918. Serial No. 238,606.

To ail whom it may concern:

'Be it known that I, ALBEN E. LUNDELL, a citizen of the United States, residing at New York, in the county of Bronx and State of New York, have invented certain new and useful Improvements in Telephone EX- change Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to an indicating arrangement adapted to be used in telephone exchange systems for the purpose of indieating to an operator the number of a telephone line.

It is the object of the invention to provide an indicator, which, in response to the operation of a manually operable device, such for instance as a set of keys, will indicate visually at a distant point a number in accordance with which the manually operable device set, it being a particular object of the invention to provide an arrangement of this character which may be set and which may complete its opera' tion in a very short time and in a reliable manner.

In accordance with this feature of the invention an indicator is provided which is controlled by selectively operating devices which may be selectively operated in response to combinations of impulses from a distant point, which impulses may vary either in duration, order or number.

In accordance with a further feature of the invention, the manually operable device, when set in various positions, operates certain contacts, which contacts are successively associated with a control circuit leading to an indicator by means of an automatic switch, the particular combination or" impulses thus impressed upon the control circuit being dependent upon which of the contacts have been operated by the manually operable device.

Other features of the in ention not specifically referred to above will more clearly appear from the following description and claims.

In the accompanying drawings Figures 1 to 6, when arranged with Fig. 2 below ig. 1, Fig. 3 to the right of Fig. 1, Fig. 4 below Fig. 3, Fig. 5 to the right of: Fig. 4 and Fig. 6 to the right of Fig. 5 diagrammatically show two opcrators positions and a trunk line connecting them, together with an indicator at one operators position and a key set and apparatus for controlling such indicator at the other operators position.

The invention is disclosed and described herein as applied to a system in which an incoming call is received at one operators position and is forwarded over a trunk line to a second operators position, such operators being referred to as the A and B operators respectively, the indicator of the invention being for the purpose oi"- enabling the A operator to inform the B operator the number of the called line.

The indicator shown diagrammatically in Figs. l, 5 and 6 comprises a separate indicating device for each digit of the number it is desired to indicate and an indicator for indicating letters forming part of the numbers, which indicators comprise a plu rality of lamps which are adapted to be selectively illuminated in response to the operation of relays in certain combinations, the particular lamp displayed indicating the particular number or letter, as the case Also associated with all of the indicators and serving to control such indicators in a manner which will be hereinafter described, is an automatic switch, which is shown in F ig. d. This switch diii ers from switches of known construction only in the driving mechanism, which as shown comprises a double wound magnet indicated at 400, the armature of which carries two pawls 4,11 and d112, adapted to engage the ratchet wheel l1?) on the rotatable brush carrying shaft of the switch. The arrangement is such that the brushes of the switch are advanced one step on each energization as well as one step on each deenergization or" the motor magnet 4:00. The two windings on the magnetlOO are so arranged and proportioned that the energization of both windings is ecessary to cause the attraction of the armature, although when the armature has once been attracted, current in either one of the windings is sufficient to hold the attracted armature. This magnet is jointly controlled by two relays 101 and 402 which will be referred to as the selecting relays.

' .ratus at the A operators posiiiising key controlled registers a controlling sequence switch is also of i 1 construction, and is shown diagramnotically in Fig. 2 of the drawing. All of theapparatus inclosed in the broken line tion rent an l signal 102 to be displayed.

rectangle on the figure is individual to the register equipment, while the various contact springs outside of this rectangle are individual to and operated by the sender sequence switch indicated at 200. This sequence switch 200 is the ordinary 18-position sequence switch, but as will more clearly appear from the description of the operation of the system, advantage is taken of the fact that in a sequence switch of the ordinary construction, the contacts, which are necessarily of some breadth, extend for five degrees on either side of the position in which such contact is intended to be closed. As there are eighteen positions, the mid-point of succeeding positions are spaced twenty de rees apart, and as the contact extends five degrees or a quarter position on either side of'the mid-position, it is obvious that, if, for example, a contact is indicated as closed in position 5, such contact is closed while the sequence switch is moving from 45,- positionto 51 position. Bearing this in mind, it is evident that two contact springs indicated as closed in positions 5 and 5;}, respectively, are both closed between positions 5 and 5;}, the first contact spring being closed from 4%; to 53; and the second from 5 to 5%.

The selector switches employed in extending the connection from the A operators position to a B operators position may be of any well-known type, the type diagrammatically shown in Fig. 1 of the drawing being that disclosed in the applicants patent No. 1,168,819.

The operation of the system will now be described, it being assumed for the purposes of illustration that the number of the desired line is J3627.

When a subscriber at the substation shown diagrammatically at the left of Fig. 1 removes his receiver from its hook, the usual line relay 101 is energized and causes the An operator observing lamp 102 inserts the plug 106 in the jack'107, whereupon a circuit is established from battery through cut-01f relay 104, sleeve of the jack 107, sleeve of the plug 106, relay 103, to ground. Relays 103 and 104 arethus energized. The operators telephone may be then connected across the cord in any well-known manner. hen the operator has ascertained the number of the calledline, which in the case assumed is J3627, the operator operates the starting key 105 and immediately thereafter operates the third key in the thousands row of her key set, the sixth key in the hundreds, #2 key in the tens, #7 key in the units, and the J ken in the stations row. As soon as the key 10 is operated, a circuit is closed for the motor maguet iof sequence switch 100, from battery, througlfmich motor magnet, contact 108 (position 1), key105 to ground. The sequence switch 100 leaves its first p0- sition and moves into position 2. In the meantime, when all of the register keys have been depressed, a common energizing circuit is closed for the various register magnets, which may be traced as follows: from battery, through the motor magnet of the thousands register 201, armature and back contact of the cut-off relay 200 to conductor 215; from battery through the motor magnet 202 of the hundreds register, through the armature and back contact of the cut-off relay 207, to conductor 215; from battery, through the motor magnet 203 of the tens register, armature and back contact of the cut-off relay 208, to conductor 215; from battery, through motor magnet 201 of the units register, armature and back contact of cut-oil relay 209, to conductor 215; and from battery, through the motor magnet 205 of the stations register, armature and back contact of cut-oif relay 210, conductor 215, and from thence through the depressed stations, units, tens, hundreds and thousands keys to ground. The thousands register, having been thus started in motion, will rotate until, when its third position is reached, a ground is placed on contact 210 (position 3) due to the operation of the third thousands key, and a circuit will be closed through cut-oil relay 206 from battery through spring 216 (position 3) to ground at the depressed key. The operation of the relay 206 opens the energizing circuit for the register 201 and stops the thousands register in position 3. Similarly, when the hundreds register reaches position 6, cut-oil relay 207 will be operated and stop the register in such position. When the tens register reaches position 2,cut-ofl' relay 208 will operate and stop this register in position 2. Nhen the units register reaches position 7, cut-off relay 209 will op crate and stop this register in position 7. When the stations register reaches position J, which corresponds to position 2, cut-off relay 210 will be operated and stop this register in position 2, or J When all of the registers have thus been set in response to the depression of the keys, an energizing circuit is closed for the register sequence switch 200 from battery, through the motor magnet of such register sequence switch, contact 217 (position 1), conductor 218, lefthand armature and front contact of relay 206, left-hand armature and front contact of relay 207 ,left-hand armature and front contact of relay 208, left-hand armature and front contact of relay 209, left-hand armature and front contact of relay 210, to ground. Sequence switch 200 thereupon leaves position 1 and stops imlfiposition 2. With the sequence switch ltlil in position 2 and sequence switch 200*:ilso in position 2, a fundamental circuit leading to a selector switch is established frombattery, through line relay 109, contact 110 (position 2), conductor 111, contact 219 (position stepping relay 211, arma tire and back contact of the counting relay 212, contact 220 (position 2), conductor 112, contact 113 (position 2), to ground.

For the sake of convenience, the selector switch shown in Fig. 1 has merely been indicated as a ten or more point switch, the brushes of which are adapted to be moved to one of ten or more contacts connected to trunk lines leading to a B operator. And, assuming, for example, thau in response to the operation of the oflice key K, the sixth counting relay has been energized, the selector switch will connect to the sixth trunk appearing therein, which, it will be assumed, leads to an idle operator. It will be obvious, however, to anyone skilled in the art that this selector switch may be replaced by the ordinary selector switch in which there are a large number of trunk lines divided into groups, which switch is adapted to be moved to select a group of trunk lines under the control of counting relays and is, thereafter, adapted to select an idle one of such trunk lines. As soon as the fundamental circuit is established, the line relay 109 and the stepping relay 211 are energizer. The energization of stepping relay 211 completes a circuit for counting relay 6 from grounded battery, winding of counting relay 6, armature and back contact of the upper counting relay associated with relay 6, closed contacts or? oflice key K, to ground at the armat ire and front contact of stepping relay 211. Counting relay 6 is energized and prepares, in the well-known manner, a circuit for the upper counting relay associated with it, this circuit extending to ground at sequence switch contact 290 (position 2), this circuit becoming effective upon the first deenergization of stepping re lay 211. In response to the energization of the line relay 109, circuit is closed from battery to the motor magnet of sequence switch 100, conductor 11 1-, contact 15 (position 2), front contact and right-hand armature of relay 109, to ground, whereupon the sequence switch 100 moves from position 2 to position 3. In position 3, a circuit is established for the motormagnet 117 of the selector switch, which is thereupon started in motion; As the selector is started in motion, grounded brush 118 in passing over the commutator 119 intermittently shunts the stepping relay 211. In response to the energization and deenergization of the stepping relay 211, the counting relays perate, and, when the sixth shunting has occurred, the last counting relay 212 will be energized and open the fundamental circuit previously traced. The opening of the fundamental circuit causes the relay 109 to be deenergized, whereupon a circuit is established from battery through the motor magnet of sequence switch 100, conductor 1161, contact 115 (position 3), back contact and right-hand armature of relay 109, to ground. The sequence switch 100 moves from position 3 to position 11. Vlien the last counting relay 212 was ener ized, a circuit was closed from battery, to the motor magnet of the sequence switch 200, contact 217 (position 2), front contact and left-hand armature of counting relay 212, to ground, whereupon the sequence switch 200 moves into position- 3.

With the sequence switch 200 in position 3 and sequence switch 100 in position 11, a circuit is established from battery, relay 401, conductor 1-17, back contact and lower armature of relay 300, conductor 301, terminal 121, brush 123, contact 121 (position 11), conductor 112, contact 220 (positions 3 to 35;), relay 213 to ground. Relays 4-01 and are energized, and relay 101 establishes circuit for relay 103, from battery, 'hrough the armature and contact of the holding magnet 11S, relay 4:03, conductor 4.1.9, normal contact and arm 120 of the indicator switch, right-hand armature and front contact of relay 101, lefthand armature of relay 1-02 to ground. lie-lay 4103 when energized closes at its right armature a locking circuit for itself and at left armature a circuit for relays 102 and 21st from battery, relay 402, left armature and contact o relay 51-03, conductor 122, upper armature and back contact of relay 300, conductor 302, terminal 120, brush 1.22, contact 125 (position 11), conductor 11 1, contact 219 (positions 3 to 31;) contact and armature of relay 213, relay 211 to ground. Relay 211, when energized, establishes a circuit from battery, through the motor magnet of the sequence switch 200, contact 21'? (position 3), conductor 220, armature and contact of relay 214: to ground. The sequence switch 200 thereupon leaves position 3 and rotates back to its normal or first position and, in passing from position 3 to position 18, controls the setting of the indicator in accordance with the position or the registers in a manner which will now be described.

as both relays e01 and are ene p, store the sequence switch 200 leaves POL. tion 3, both windings ot the motor magnet 100 are energized from .ry through the left winding of magnet 100, from; contact and left armature of relay to groin from battery, right windi" front contact and le'"t to ground. The (it s r n uro and the i mater switch is moved one stop and anus no and are brought into contact with the first'set pf contacts indicated at 1, 1.

Owing to the fact as explained above that J, 1 i00- attracts its ar- 4 tllO the sequence switch contacts extend tive dc grees on either side of the mid-position, before the lower contact of spring 219 is broken in leaving position 34, the upper contact indicated closed at 31} to 351- is closed and as the stations register is set in position J, a ground is placed on contact 219 from register contact Therefore relay 402 will remain energized. Although contact 222 will be closed before contact 220 is opened, no ground is found on contact as the re ister contact 221 is open in position Therefore, as the Sequence switch 200 leaves position 3 relay 401 is deenergized and relay 402 remains energized. Under these conditions a circuit is established from battery, off-normal contact 423, indicator switch relay 404, back contact and armature of relay 40.5, conductor 424, arm 421, right armature and front contact of relay 402, left armature and back contact of relay 401 to ground. Relay 404 is energized and closes a locking circuit for itself in series with relay 405, from battery, off-normal contact 423, relay 40-4, front contact and right armature thereof, relay 405 to ground. Relay 405 is energized in this circuit. Before the contact 219 is opened in leaving position 3;}, contacts 225 and are closed in p sition 4 and a ground is placed upon both conductors 111 and 11.2, and relay 402 will remain energized and relay 401 will become energized. The encrgization of relays 401 and 402 at this time, however, will be without effect as the armature of the switch magnet 400 has been maintained attracted owing to the fact that the circuit previously established for the right-hand winding thereof has been maintained. by the continued energization of relay 402. Before the contacts and 223 are opened upon the sequence switch 200 leaving position 4, contacts 222 and 224 are closed in position 41-. In position 411;, a ground is connected to the conductor 111 from the register spring 221 in position J through the contact 224. However, in this position no ground is connected to the contact spring 222 as the register spring 221 is open at position J, so that relay 402 will remain energized and relay 401 will again be deenergized. Therefore, a circuit will be established for relay 406 which may be traced from battery to the off-normal contact 423, relay 406, armature and front contact of relay 405, conductor 424, arm 421, right armature and front contact of relay 402, lefthand armature and back contact of relay 401 to ground. \Vith the relay 406 energized, after theindicator switch has passed through all of its positions and the contact arm 425 is consequently closed, a circuit will be closed to display the lamp J, from battery through the lamp J, left-hand armature and front contact of relay 406; conductor 426, conductor 427, contact arm 425 to ground.

It will be observed, however, that the relay 406 in energizing closes a locking circuit for itself at its right-hand armature, so that it will remain energized until the indicator switch has passed through all of its positions and the contact arm 425 is operated. \Vhen the sequence switch 200 passes through position 45;, contacts 222 and 224 are opened and no other contacts connected with the conductors 112 are closed until position 5, is reached, when contacts 224 and 226 are closed. As there is of a position between 4-1- and 5, there will be no ground on either of the conductors 111 or 112 for at least 4 of a position, which is sufficient to permit the deenergization of relays 401 and 402. Both the relays 401 and 402 being denergized, both of the energizing circuits for the magnet 400 are interrupted and the armature of such magnet is released, stepping the indicator switch to the next step or to the N o. 2 set of contacts. As soon as position 5 is reached by the sequence switch 200, remembering that the thousands register is set in position 3, a ground is placed upon the con ductor 111 through contact (position 5), register contact 227, in position 3, and sequence switch contact 228 (positions 5 to 611-), to ground. N0 ground is placed upon the conductor 112 in this position 5, as the register-contact 229 is not closed in position 3. Therefore, relay 402 is energized. As the cnergization of relay 402 establishes a circuit for only the right-hand winding of the magnet 400, such magnet will not operate and the indicator switch Will remain in po sition 2. However, in response to the energization of relay 402, a circuit is established for relay 506 of the thousands indicator from battery, ofl normal contact 423, conductors 428 and 429, conductor 507, relay 506, conductor 430, arm 421, right armature and front contact of relay 402, left armature and back contact of relay 401. Relay 506 is energized and closes at its left armature and front contact a locking circuit for itself.

Before the sequence switch 200 leaves position 5, contact springs 225 and 223 are closed in position 54 and ground is connected to both conductors 111 and 112 at such contacts. Therefore, both relays 401 and 402 are energized and as both windings of the magnet 400 are thereby energized, the indicator switch is advanced one step or the arms 420 and 421 are advanced to the N0. 3 set of contacts. Before the contacts 225 and 223 are opened, when thesequenee switch leaves position 59,-, the contacts 226 and 230 are closed in position 5% and as the thousands register is in position 3, ground is connected to the conductor 111,. through contact 230, register contact 227; sequence switch contact 228 to ground. With the thousands register in position 3 no ground is connected to the contact 226. Hence the circuit for the relay 501, such circuit being the same as that previously traced for the relay 500, except that from relay 500 the circuit extends to ground through the arm ture and front contact of such relay and through relay 501 instead of through conductor 508. Before thesequence switch 200 leaves position 5%, contacts 225 and 223 are =zlosed in position 6 and place ground on both the conductors 111 and 112. ,The relay 402, therefore, remains energized and the relay 401 becomes energized. However, a simultaneous energization of these two relays at this time is without effect on the indicator switch as the magnet 400 has remained onergized due to the continuous energization of the relay 402. As the sequence switch 200 leaves position 6, the contacts 223 and 230 are closed in position 61:. Therefore, when the sequence switch reaches position 61,: a ground will be maintained on conductor 112, through contact 223, register contact 229 in position 3. sequence switch contact 228 to ground. There will be no ground, however,

hand armature and front contact of relay 401, left armature and back contact of re lay 402 to ground. Relay 503 is energized over this circuit and closes at its righthand armature and front contact a locking circuit for tself, and an energizing circuit for the relay 504-, which circuit extends from the conductor 511, through the relay 503, right armature and front contact of relay 503, relay 504 to ground. l lith the relays 506, 503, 504, 500 and 501 energized, when the indicator switch has passed through all its ten positions, a circuit is established for the No. 3 lamp on the thousands indicator from battery, the right armature of relay 506, contact 513, conductor 514, lamp No. 3, conductor 515, contact 516, left armature of relay 503, front contact and left armature of relay 500, back contact and right armature of relay 502, back contact and armature of relay conductor 517, conductor 518, conductor 42?, through contact 425 to ground.

When the sequence switch 200 leaves position 6 1:, no other contacts connected with the conductors 111 and 112 are closed until position 7 is reached. Therefore, there will be at least one quarter of a position between and 7 in which there will be no ground on either of the conductors 111 and 112. T he relays 401 and 402 will thus be de'energized at the same time, and the energizing circuit for both windings of the indicator switch magnet 400 will be opened. As a re sult of the deencrgization of the magnet 400, the indicator switch will he stepped forward one step, or into contact with the fourth set of terminals.

When the sequence switch 200 reaches position 7, contact 233 of the sequence switch will be closed, and register contact 228 of the thousands register will be opened, and sequence switcnspri- 226 (bottom) and (bottom) are closed in position 7. It being remembered that the hundreds register has been set in position 6, there will be a ground placed on conductor 112 through contact 226 in position 7, and hundreds register contact 234 in position 6, and from thence through in position 7 to ground. hGT-IGVQI, there will upon the conductor At this time, be no ground placed 111 as the hundreds regster contact is open in position 6. T- ereiore, the relay 401 will be energized and relay 402 will not be operated. The energization of the relay 401 at this time connects ground to the arm 420 from the left armature and back contact of relay 402 to the right armature and front contact of relay 401 to ground 420, but as the fourth contact with which the arm 420 cotiperates is a dead contact, nothing will result. Before the sequence switch 200 leaves position 7, the contacts and 223 are closed in position 74-, placing ground upon both of the conductors 111 and 112, and maintaining relay 401 energized, and energizing relay 402. As both the relays 401 and 402 are now en rgized, both windings of the magnet 400 are energized, and the indicator switch is advanced to the fifth set of contacts. Before the sequence switch 200 leaves position 7;}, contacts 230 and 226 are closed in positions 7-}- to 7%. Under these conditions, with the hundreds registein position 6, a ground will be placed upon conductor 111 through contact 230 in positions 75- to 7%, register spring 235 in position 6, through sequence switch contact 233 in positions 7 to 8 to ground. A ground is also placed upon the conductor 112 through contact 226 in positions 7!; to 7?}, hundreds register contact 234 the sequence switch contact in positions 5 to 9, sequence switch contact 233 in positions 7 to 8-}; to ground. There'- fore, while the sequence switch 200 is passing between positions 7%; to 7%, both of the relays 401 and 402 remain energized, and no circuit is closed to the hundreds indicator. When thesequence switch reaches position 8, contacts 225 and 233 are closed and round 1 is still maintained on both of the conductors I energized. When the sequence switch 200 .111 and 112, and relays 401 and 402 remain reaches position 84, ground is maintained on conductor 112 through the contact 223, hun- ,dreds register contact 234' in position 6, seqnence switch contact 233 in positions 7 to 8 9;, to ground. There is no round, however, upon conductor 111 in this position of the sequence switch, as the hundreds register spring 235 bottom is open in position 6 of the hundreds register, and consequently there is no ground connected to contact 230 in position 81-. Therefore, with relay 401 energized and relay 402 deencrgized, a circuit is closed from battery through the off-normal i contact 423,eonductor 428,conductor 429,con

ductor 525, relay 519, back contact and armature of relay 520, conductor 526, conductor 433, arm 420, front contact and armature of relay 401, back contact and left armature of relay 402 to ground. Relay 519, when energized, closes at its right armature a substitute locking circuit for itself, which up to .522, backlcontact and armature of relay 523,

right armature and back contact of relay 521, conductors 532, 518, 427, to contact 425 and to ground. 7

When the sequence switch 200 leaves po- & .sition 84, no other contacts associated with the conductors 111 and 112 are closed until the sequence switch reaches position 9. Therefore, for at least 4 of a position no circuit will be established for relays 401 and 402. which relays release and open both windings of the magnet 400. Magnet, 400 is thereupon deenergized and the arms of the indicator switch move to the sixth set of contacts. When position 9 is reached by the sequence switch 200 with the hundreds register set in position 2, there will be no ground upon the conductor 111, but there willbe a ground placed upon the conductor "112 from contact 236 (position 9), tens register contact 232 in position 2, contact 226 asthe tens register-is in position 2, a

in position 9, to conductor 112. Relay 401 will therefore be energized and relay 402 will be denergized. Under these condi-' ture of relay 401, but, as. in position six the.

arm 420 is resting upon a dead contact, the tens indicator will not be affected. Before the contacts 226and 224 are opened by the sequence switch in leaving position 9, contacts 225 and 223 are closed in position 9%; and ground is connected through such contacts to both of the conductors 111 and 112. The relay 401 therefore remains energized and the relay 402 is energized. The simul= taneous encrgization of these relays closes a circuit for thewindings of the magnet 400 to attract its armature and moves the inclicator switch arms to the seventh set of contacts. .iefore the contacts 225 and 223 are opened and the sequence switch leaves position 91-, contacts 230 and 226 are closed in position 9}. Therefore, when position is reached there will be a ground placed upon the conductor 111 through contact 230 position 9-}- to 9}), tens register contact 237 in position 2,.eontact 236 (position 9-l,-) to ground. There will, however, be no ground maintained upon the conductor 112 as the right upper'contact of the tens register contact 232 is open in position 2.

Therefore, under these conditions, relay 401- will be deenergized and the relay 402 will be maintained energized; and a circuit will be established for the relay 603 of the tens indicator from battery, off-normal contact 423, conductor 428, conductor 429, eonductor 533, conductor 601, conductor 606, relay 603, arn'lature and back contact of relay 604, conductor 607, conductor 534, conductor 434. arm 421, right-hand armature and contact of relay 402, left armature and back contact of relay 401, to ground. Relay 603 at its right armature closes a locking circuit for itself in series with relay 604. This circuit extends from battery, through the off-normal contact 423 to relay 603, as previously traced, and then to right armature and contact of relay 003 through relay -4 to ground. When the sequence switch 200 reaches position ten, a ground is placed upon both the conductors 111 and 112 at conta ts 225 and 223. Therefore the relay 402 will be maintaiW opergiz-ed and the relay 401 will ,mergizcd. the magnet 400 has not released. being held up over its right winding due to the OXQVIOHS energizationaof relay 402, a simultaneous energization of relay 401 and 402 will be without effect this time. Before the cor-. tacts 225 and sition 10. contacts 230 and 223 will be closed in osition 103:. Therefore. in this position. ground are opened in leaving po- Will be placed upon the conductor 112 through contact 223 (position 109,), tens register contact 232 in position cont; 236 (position 105,-), to ground.

There it 7 however, be no ground at this time the normal contact 423, conductors 429, 533, 601, relay 608, armature and back contact of relay 609, conductors 611, 535, 435, arm 420, right armature and front contact of relay 401, left armature and back contact of relay 402 to ground, When relay 608 is energized, it closes at its right-han armature and contact a locking circuit for itself including the relay 609, which circuit extendsfrom battery, through the oil-normal contact 423, to relay 608 as previously traced, and from thence to the trout con tact and right armature or such rela', through the relay 609, to ground. With the relays 603, 604, 608 and 609 energized,

when the indicator switch has passed through all of its positions and the contact 425 is closed, a circuit will be estabzished for the #2 lamp of the tens indicator from battery, through the right-hand armature and contact of relay 600, conductor 612, #2 lamp, contact 613 01 relay 606, left armature of such relay, left armature and front contact of relay 603, right amnature and back contact of relay 605, right rmature and back contact of relay 610, conductors 613, 518, 427, and to ground through the contact 425.

As sequence switch 200 passes from position 10?; to position 11, ground will he removed from both of the conduct rs 111 and 112 for at least position and relays 401 and 402 will both be deenergizcd Vith the simultaneous deenergization of the relays 401 and 402, both windings of t magnet 400 will he opened, causing; such magnet to release its armature and step the indicat switch to the eighth set of contacts. lVhen the sequence switch 200 reaches position 11 with the units re 'ter in position '4', a ground will be placed upon the coudn 111 through contact 224, position 11, units register contact 238 in position 7, to ground. This will cause the ene the relay 402. lVi h the relay 4 the relay 401 denergizecha h'shecl for relay 6140f the un's indies from battery, through the otl nor ial cm 423, conductors 428, 429, 533, 601, relay conductor 621, 536, 436, a .m right a: ture and contact of relay 402, left armature and back contact of relay 401, to ground. When the sequence switch reaches position 11;}, ground is placed upon both of the conductors 111 and 112 through contacts 223 contact 230 in posi ion 11 1-, u contact 238 in po 1 ion 7, r contact 239 in position r cunt Ground l. will also he 1 1 conductor 112 r gister energization of "is e tr: relays will he with out effect at this time upon the units indicator. When the switch 200 reaches position ground will he upon conductors maintained 112 through conductors 23 position. However, 1 s "itch r aches position 12 1;, be maintained upon the conduc through the con 223 in posi"on throu the register contact "0 in position b u 7, contact 239 in position ground,

There will he no ground, however, upon the conductor 111 in this uositlon,

Vhth rel 4 a C1 v. relay 616, from 1 a -norin 423, conductors 429, 601, r back contact and armature of relay 515, conductors 622, 537, 437, 211 20, right armature and contact of relay 401, left armature and back contact of relay 40, ound, Belay 616, when energized, clo oclzing circuit for itseli battery, ofinorinal contact'423, to relay 616 as previously traced, and from thence through the front contact and right armature oi relay 616, relay 615 to ground, energizing relay 615.

."Vith tnc relays 614, 615 and 616 energized, when the indicator switch has passe 1 through all of its positions, and hence the contact 425 is closed, a circuit the lamp of the units indicator is closed from battery, right armature of relay tact 623, conductor 62-1, the 6%? lam t ar nature and hack contact of relay 618, right arm"- re 1 hack contact of relay 620 and right arniature and each contact of relay 617, condu tors 613, 518, 42'? to ground at contact 4 5.

When the sequence switch 200 lea es position 12%;, the circuit previously traced for relay 401 will be opened, and as both relays 401 and 402 are then dcenergzized, both Wind ings of the magnet 400 Will be opened. The magnet 400 thereupon releases its armature,

including relay 615, from and the indicator. switch is stepped forward to its tenth position, in which position arm 4'21 engages and operates the contact #125.

It will be apparent from the foregoing description that as soon as tie contact 425 is operated, the J lamp of the stations indicator, the #3 lamp oi? the thousands incicator, the #6 lamp oi? thelnindreds indicator, the #2 lamp oi? the tens i., licator and the t'-7' lamp of the units indicator will be simultaneously illu minated, indicating to the B operator that the number oi? the Also, as soon as the called line is il 3337 contact 425 is closed, a circuit is established for the relay 300, from battery, relay 300, conductors 302 and 4.38 to contact and ground. The relay 300 is energized and disconnects conductors +i17 and 422 from the trunk, and extends the conductors 301 and 302 to the plug 303.

The B operator, observing the number of the wanted line on the indicator,inserts the plug 303 into the jack 304, which, it will be assumed, is the jack leading to line J-3627. As soon as the plug is inserted in the jack a circuit is closed from battery, relay 305, sleeve of plug, sleeve of jack, cut-off relay 306 to ground. Relays 306 and 305 are energized, and relay 305 closes at its upper armature a substitute energizing circuit for relay 300, from battery, relay 300, inner lower armature thereof, conductor 310, contact and upper armature of relay 305 to ground. The relay 305 also closes a circuit for the relay 308, from battery, off-norn'ial contact 423, conductor 139, conductor 31]., relay 308, right armature and back contact of relay 307, contact and lower armature, relay 305 to ground.

The energization of the relay 308 establishes an energizing circuit for relay 309 from battery, through relay 309, armature and contact of relay 308 to ground. Relay 309 closes at its'left armature a circuit for the holding magnet 118 from battery, through magnet 41S, conductor 140, conductor 312, left armature and contact of relay 309, left armature and contact of relay 307 to ground. Magnet 418 will be energized. momentarily and will permit the return of the indicator switch to normal under the influence of the spring indicated at 441. Also due to the energization of relay 309, a circuit is established from battery, through relay 309, right armature and contact of such relay, relay 307 to ground at the upper contact and armature o't relay 305. Relay 307 will be energized in this circuit and will open the circuits previously traced for the relays 308 and the holding magnet 4:18. As soon as the indicator switch is returned to normal, the indicator lamps are extinguished, and all of the relays of the indicator are returned to norn al. The B operator thereupon signals the called subscriber in the usual manner. At

the termination of conversation disconnection may take place in the usual manner.

Having described in detail the operation of the indicator in indicating a typical number, it is thought that the operation of the indicator in indicating any other number will. be sufficiently apparent. It will be obvious that inresponse to the depression of any combination of keys the various registers will be moved to the corresponding combination oil positions, and as the sequence switch 200 rotates from position 3 onward, ground will be maintained and removed from conductors 111 and 112 in various' combinations, causing the energization and deenergization of the relays 401 and 102 in the same combinations. In e1- fect, the sequence switch together with the set position of the registers serves to impress impulscs on the conductors 111 and 112, and thence over the trunk to the relays 401 and 402, and it will be observed that such impulses may vary in order,'in duration or in number, depending upon the set positions of the registers.

As the entire operation of the indicator takes place while the sequence switch 200 is moving from position 3, through position 123;, the operation of the indicator is very rapid. l

\Vhat is claimed is:

1. In a signaling system, a plurality of line conductors, mean for impressing on said line conductors various combinations of signaling impulses, a receiving system connected to said line conductors, a plurality of devices thereat adapted to be selectively actuated in response to said ignaling impulses, a relay in circuit with and responsive to said impulses in each of said line conductors, said relays cooperating to complete an operative circuit to one or another of said devices, depending upon the respective order and relative duration of the impulses in said different line conductors.

2. In a signaling system, a pair of line conductors, means for impressing on each of said line conductors combinations of signaling impulses of different durations and for transmitting the impulses to one line conductor in such order as to coincide with or overlap the periods of no current in said other line conductor, a receiving line relay in each of said line condupgors responsive to signaling impulses thetbin, a plurality of selective devices under the joint control of said relays, and means for completing an operating circuit to one or another of said selectiyfe devices depending upon the relative order and duration of actuation of said line relays.

3. In a signaling system, a plurality of lines, means for transmitting combinations of impulses over said lines, aplurality of mechanisms to be actuated, a plurality of inter-dependent device adapted to be selected by said mechanisms, a plurality of means associated with said lines and actuated by said combinations of impulses to operate said devices, the devices operated by any actuation of one of said means during a given interval of time being dependent upon the character of the actuation of the others of said means during the sameinterval of time. i

4-. In a signaling system, a plurality of lines, means for impressing on said lines combinations of signaling impulses of different characteristics, means in said lines actuated by said combinations of impulses, a plurality of selective devices adapted to be selected by said means, the devices selected in response to any actuation of one of said means for a given interval of time being dependent upon the character of the actuation of the others of said means during the same interval of time.

5. In a signaling system, a plurality oi mechanisms to be actuated, an actuating circuit for each of said mechanisms, said circuits containing a plurality of break points, a plurality of selectively actuated 1neohanisms for closing said break points, a plurality of lines, means for transmitting combinations of impulses over said lines, a plurality of mechanisms in said lines, means operated when said line mechanisms are actuated by a combination of impulses to cause the closing of the break points leading to a mechanism to be actuated, the efi'ect of any actuation of one of said line mechanisms for a given interval of time being dependent upon the character of the actuations of the others of said line mechanisms during the same interval of time.

6. In a telephone exchange system, an arrangement for indicating the number of a telephone line comprising an indicator, a circuit leading thereto, manually operable means adapted to be variably operated in accordance With the designation of the line, means controlled from said manually operable means for impressing impulses varying in duration, order and number on said circuit, and mean at said indicator adapted to be selectively operated in response to said impulses to cause the display of the number represented by the operation of such manually operable means.

7. In a telephone exchange system, an arrangement for indicating the number of a telephone line comprising an indicator, a circuit leading thereto, keys adapted to be variably operated in accordance with the designation of the line, means controlled by the operation of said keys to impress impulses varying in duration, order and numher on said circuit, and means at said indicator adapted to selectively operate in response to said impulses to cause the display of the number represented by the operation or" the said keys.

8. In a telephone exchange system, an arrangement for indicating the number of a telephone line comprising an indicator, a circuit leading thereto, a manually operable device adapted to be variably operated in accordance with the number of the line, registers adapted to be va *iably set under the control of such manually operable device, means controlled by the set position of such registers for impressing combinations of impulses varying in duration, order and num ber on said circuit, and means at said indicator adapted to be selectively operated in response to said impulses to cause the display of the number of said line.

9. In a telephone exchange system, an arrangement for indicating the number of a telephone line, a plurality of digit indicaters, a control circuit leading to such indicators, selecting relays included in such con trol circuit adapted to be operated in various combinations in response to controlling impulses in such control circuit, and means controlled from such relays for successively associating such relays with such digit indicators.

10. In a telephone exchange system, an ar-' rangement for indicating the number of a telephone line, an indicator and control circuit leading. thereto, a variably operable manually controlled device, registering devices controlled thereby, contacts operated in the set positions 01 said registers, means for successively connecting said contacts with said control circuit, and means included in such control circuit responsive to an electrical potential on such operated contacts to selectively control said indicator.

11. In a telephone exchange system, an arrangement for indicating the number of a telephone line, an indicator and a control circuit leading thereto, a manually operable means adapted to be variably operated in accordance with the number it is desired to indicate, contacts operated by such manually operable means, a sequence switch for successively associating said contacts with the control circuit, and selecting relays in such control circuit adapted to be operated in response to a potential on such operated contacts. and means controlled by such relays to selectively operate the indicator.

1'2. In a telephone exchange system, an

arrangement for indicating the number of a telephone line, an indicator comprising a plurality of indicator relays adapted to be operated in various combinations, control circuits leading to such indi ator including a pair of selecting relays responsive to impulses sent over such control circuits simuL taneously, and circuits for said indicator relays controlled by suchselecting relays, the

combination of indicator relays operated in any given case being determined by the relative operation of such selecting relays.

13. In a telephone exchange system, an arrangement for indicating the number of a telephone line, an indicator, control circuits leading thereto, selecting relays in such control circuits adapted to selectively control such indicator, manually controlled means adapted to be variably operated in accordance With the digits of the number of the line, and means controlled from such manually operable means to impress combinations of impulses on such indicator control circuits simultaneously to operate such selectim relays in varying combinations.

'14. in a telephone exchan e system, an arrangement for indicating the number of a telephone line, an indicator comprising indicating devices, sets of indicator relays arranged in groups, a control circuit leading to such indicator, a pair of selecting relays in such control circuit, means responsive to the simultaneous energization or deenergization of such selecting relays to associate such. selecting relays with successive groups of indicator relays, and circuits established by the simultaneous energization of one selector relay and de'elnergization of the other to select various relays in a group of indicator relays.

15. In .a multi-office telephone exchange system, calling and called lines, a final connecting operators position, a trunk line, means including said trunk line for extending acalling l1ne to said position, means for automatically indicating the number of a called line at said position, means for sending impulses of varying characteristics over said trunk line, and means responsive to said impulses to control said indicating means.

16. In a multi-otfice telephone exchange system, calling and called lines, a final connecting operators position, a trunk line, means including said trunk line for extending a calling line to said position, means for automatically indicating the number of a called line at said position, means for sending impulses over both sides of said trunk in parallel, and means responsive to said im ulses to control said indicating means.

75111 a multi-office telephone exchange system, calling and called lines, a final connecting oprators position, a trunk line, means including said trunk line for extending a calling line to position, means for automatically indicati the number of a called line at said position, means for sending impulses over both sides of said trunk in parallel, and a plurality of means res onsive to said impulses to control said indicat- 1f means.

8. Tn a multi-oflice telephone exchange system, calling and called lines, a final con necting operators position, a trunk line, means including said trunk line for extending a calling line to said position, means for automatically indicating the number of a called line at said position, means for sending impulses over both sides of said trunk in parallel, and a pair of means responsive to said impulses to control said indicating means.

19. In a multi-oflice telephone exchange system, calling and called lines, a final connecting operators position, a trunk line, means including said trunk line for extending a calling line to said position, means tor visually displaying the number of :1- called line at said position, means for sending impulses of varying characteristics over said trunk line, and means responsive to said impulses to control said indicating means.

20. In a inulti-of'fice telephone exchange system, calling and called lines, an A operators position, a B operators position, a trunk line, means including said trunk line for extending a calling line from said A operators position to said B operators position, means for automatically indicating the number of a called line at said I5 operators position, means at said A operators position for sending impulses of varying characteristics over said trunk line, and means responsive to said impulses to control said indicating means.

21. In a multi-ofiice telephone exchange system, calling and called lines, an A op erators position, a B operators position, a trunk line, means including said trunk line for extending a calling line from said A operators position to said B operators position, means for automatically indicating the number of a called line at said B operators position, a step-bystep switch operated over one of said trunk conductors, means controlled by said A operator for sending impulses of varying characteristics over said 1 trunk line, and a combination of relays operated over said trunk line in response to said impulses.

22. In a telephone exchange system, a number indicating deviceycomprisinga set 11 of ten indicators for each digit of the maximum number it is desired to indicate, electro-responsive devices less in number than said indicators, manually controlled means for energizing such electro-responsive devices in various combinations, and a circuit for each indicator controlled by a pair of such electro-responsive devices.

23. In a telephone system, a pair of lines, means for opening and closing said lines, means for controlling said opening and closing means to transmit impulsea to one of said lines in such order as tpl icoincide with or overlap the interval of noturrent in said other lines, a relay in each of said lines, a

plurality of selecting devices under the joint control of said relays, and means for completing an operating circuit to one or another of said selecting devices depending upon the relative order and duration of actuation of said line relays.

2a. In a telephone system, a plurality of lines, means for opening and closing said lines, means for controlling said opening and closing means to impress a combination of signaling impulses of difierent characteristics on said lines, a plurality of line relays actuated by said combination of impulses, a plurality of selecting relays adapted to be operated by said line relays, the selecting relays actuated in response to the operation of one of said line relays for a given interval of time being dependent upon the character of operation of another of said line relays during the same interval of time.

25. In a telephone system, two conductors, means for simultaneously transmitting over each of said conductors a different train of impulses, a signaling device, and means controlled by both of said trains of impulses for selectively operating said signaling device.

26. In a telephone system, two conductors,

means for simultaneously transmitting over one of said conductors impulses of one character and impulses of a diiferent character over the other of said conductors, a signaling device, and means controlled by the impulses transmitted over both conductors for selectively operating said signaling device.

27. A selection controlling system com-. prising means for simultaneously generating two series of electrical impulses, a plurality of relays arranged to be variably operable in response to said electrical impulses, and devices associated with said relays and variably controlled thereby.

28. A selection controlling system comprising means for simultaneously producing two series of electrical impulses, a group of relays arranged to be variably operated in response to said impulses, a locking circuit for each relay completed during its actuation, and devices variably controlled by said relays.

529. A selection controlling system comprising a device for simultaneously producing two series of impulses in various combinations, devices arranged to be variably operated in response to said impulses, and means variably controlled by said devices.

30. A selection controlling system comprising a device for simultaneously producing two series of electrical impulses in various combinations, devices arranged to be selectively operated in response to said im pulses, and means variably operated under the control of said devices.

31. In combination, control circuits, means for transmitting series of impulses of various characterlstics over said control circuits simultaneously, mechanisms to be controlled, operating circuits for said mechanisms, a multi-position switch controlling in its various positions certain of said operating circuits, and means responsive to said series of impulses for operating said switch.

32. In combination, control circuits,means for transmitting series of impulses of various characteristics over said control circuits simultaneously, mechanisms to be controlled, operating circuits for transmitting the impulses of the series to said mechanisms, a multi-position switch controlling in its. various positions certain of said op erating circuits, and means responsive to said series of impulses for operating said switch.

33. In combination, control circuits, means for transmitting series of impulses of various characteristics over said control circuits simultaneously, a variable operable indicating device, operating circuits therefor, a plurality of switching relays for controlling said circuits, and means responsive to a series of impulses for cooperating in the control of said switching relays.

In witness whereof I hereunto subscribe my name this 15th day of August, A. D. 1916.

ALBEN E. LUNDELL. 

